Charles hanimann



(No Model.)

0. HANIM-ANN.

TUBE ERASER.

No. 447,873. Patented Mar. 10, 1891.

' face on erasers of the ordinary form.

STATES ITE o CHARLES llANlMANN, OF NEW YORK, N. Y.

TUBE ERAS ER.

SPECIFICATION forming part of Letters Patent No. 447,873, dated March10, 1891.

Application filed June 13, 1890. Serial No. 355,338- (No model.)

T0 or whom it may concern:

Be it known that I, CHARLES HANIMANN, a citizen of the United States,and a resident of New York, county and State of New York, have inventeda certain new and useful Improvement in Tube Erasers, of which thefollowing is a specification.

My invention relates to that class of articles ordinarily designated aserasers, and in particular to pencil and ink erasing appliances whichare commonly constructed out of rubber, and has for its object theprovision of a device simple in construction, cheap in man ufacture,economical, and efficient in practical;

tive view of my tube eraser as it appears in' the hand of an artist whenin practical use. Fig. 2 is a transverse vertical section on the lineyy, Fig. 3. Fig. 3 is alongitudinal vertical section on the line a 00,Fig. 2. Figs. 4, 5, 6, and 7 represent perspective views of articles ofvarious contours and forms constructed according to my invention; andFig. 8 represents my device used in combination with a lead-pencil.

Like letters of reference wherever they occur indicate correspondingparts in all the figures.

In the use of erasers as heretofore constructed-namely, in the form ofblocks or plates-great trouble has been experienced on account of therubber becoming heated by use, and much difficulty also has resultedfrom efforts to erase lines between others which do not require to berubbed out by reason of the im practicability of maintaining foranylength of time a small and sharp edgeor erasing-sur- In order toobviate these disadvatages and to provide an eraser which will becheaper in manufacture, that will not become heated in use, that willalways present a small and sharp erasingsurface, and that will allow theobliteration to be more thoroughly accomplished while requiring lesscareful manipulation and gainingincreased speed over what has beenhitherto attained, I have invented the appliance hereinafter describedas follows, to wit:

Referring to the drawings, R represents a preferably cylindrical tubeprovided upon its outer portion witha longitudinally or approximatelylongitudinally corrugated surface for convenience in grasping my eraserand holding the same in any position that may be required in use. Thetube R is provided ordinarily with one smooth longitudinal bore,channel, or orifice h, which usually conforms in contour with theconfiguration of the outer surface of the said tube R. A small sharpedge or erasing portion 0" is thereby formed which will always bemaintained as long as the eraser can be used.

My device is also adapted, by reason of the orifice h, to be used incombination with and to be applied to the end of a pen or pencil P, asis clearly shown in Fig. 8.

My eraser may be varied in formas, for example, it may be circular,oval, or triangular in cross-section, and may be provided with one ormore interior channels or orifices 7b, as represented in the drawings.

I prefer to make my tube eraser of rubber vulcanized and treated withemery, although the same may be constructed of any suitable material orcombination of materials.

As before stated, my eraser is economical in construction, as a savingof about one-half in material is made againstsolid pieces of greaterdiameter and length or of equal outside proportions. I

My device may be seized with a firm grasp and held with steadiness andprecision by means of the exterior corrugations, and a largecleansing-surface which constantly presents a sharp erasing-edge (onaccount of the small wall'thickness of the device) is maintained,thereby greatly facilitating the erasing of lines between other linesnot to be rubbed out.

By reason of the peculiar form of eraser shown, all disadvantage of thesame becoming heated is avoided entirely or largely reduced by thegreatly-increased radiating surwatchtulness, lest the drawing beinjured, that has to be exercised with the erasers now in use. This Iaccomplish by means of the greater elasticity and pliability of the bodyof my appliance, which constantly keeps in good order and alwaysmaintains the same shape.

Another great advantage of my eraser is the economy of its use by reasonof the assistance or re-enforcement given while in use by the rubberparticles worn off by attrition, and which are confined within the wallsof my eraser when held in a vertical position, which particles may beused over and over again for an indefinite period.

Having thus described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is

1. As a new article of manufacture, an eraser consisting of ahollowrubber tube provided with longitudinal corrugations on its outersurface, and with a smooth interior bore, whereby a sharp and evencircumferential edge is always maintained, substantially as described.

2. The combination, with a pencil, of an eraser consisting of a hollowrubber tube provided with longitudinal corrugations on its outersurface, and with a smooth interior bore, whereby a sharp and evencircumferential edge is always maintained, substantially as described.

In testimony of the foregoing specification I do hereby sign the same inthe city of New York, county and State of New York, this 10th day 0tJune, A. D. 1890. 7

CHARLES IIANIMANN.

\Vitnesses J. ODELL FOWLER, J12, Louis A. HILL.

